CAS Number
Formula
Weight
| Appearance | Green coloured clear liquid |
| pH | Colour |
| 0 -3 | Red |
| 4 | Orange red |
| 5 | Yellow |
| 6 | Yellow-green |
| 7 | Green |
| 8 | Blue-green |
| 9 | Blue |
| 10 | Blue-violet |
| 12-14 | Deep-purple |
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